Don't build openmp with versioned symbols.

We ship these as a static library. Versioned symbols require that a
version script be passed at link time, which would require that flag
to be passed by every user of openmp. We can't reasonably ask every
NDK build system to do this, so just disable the symbol versioning.

Test: Build clang, build NDK with that Clang, build OpenCV with
      OpenMP support.
Bug: https://github.com/android-ndk/ndk/issues/401

Change-Id: I61b1edf23d8deee1d67b8ccf2aff9cf2f9ea4729
9 files changed